The cathode carbon block is mainly composed of anthracite, coke and graphite, and its ash content ranges from 8 to 15%. The cathode carbon block used by aluminum electrolysis has higher ash content, and some are even as high as 30%.
When the carbon anode butts and the cathode carbon block are broken into a size of 100 mm, beside determining whether the cathode carbon block is derived from carbon anode butts or cathode through the ash test, it can also be determined by the sectional feature:
The main component of the carbon anode butts is calcined petroleum coke, so its section will exhibit the characteristics of calcined petroleum coke—-with obvious porous distribution and a certain metallic luster, as shown in the figure while the cathode carbon block does not have this feature（Please refer to the following picture）.
The cathode carbon block discarded by electrolytic aluminum can be used as a fuel if its quality is good, which it is equivalent to the action of coke, of course, the premise is that the content of elements such as F is relatively low.
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